videtto



Oct. 13, 1931. s. s. VIDETTO ROTARY ENGINE Filed June 21. 1926 6 Sheets-Sheet l INVENTOR J. 5. V/pfrm ATTORNEYS Oct. 13, 1931. s. s. VIDETTO 1,827,408

ROTARY ENGINE Filed June 21. 1926 6 shets-sheet 2 g; 2M655 56 {Z \9.

INVENTQR v ATTORNEYS Oct. 13, 1931. s. s. VIDETTO 1,827,408

ROTARY ENGINE Filed June 21. 1926 6 Sheets-Sheet 3 INVENTOR J15? W zrra BY M76.

Oct. 13, 1931. s 5, vlDETTO 1,827,408

ROTARY ENGINE 7 Filed June 21. 1926 6 Sheets-Sheet 4 INVENTOR I Lid 1 /05770- BY Mvfi,

' ATTORNEYS 5. S. VIDETTO ROTARY ENGINE Oct. 13, 1931.

6 Sheets-Sheet 5 I Filed June 2]., 1926 INVENTOR J J 7770/ 770 BY Md 7 ATTORNEYS l mmed m g mfigi .1 Q

11; hpl ti "51 1 1 My inventioriii elates to improvements in rotary eiigines, audit consists inthe oo'r'nbinm 'tions} oo'nstructionsfand arrangements herein described gnd claimedfl f 1'11 w;

' Anobjeet of myinv ention is'to' provide on improvement? over that form of the: device shown in my eopendihcr a plication for patent on rotary engineogierial @No. 713,844,

Afurtherob ectf of v 19 invention is to pro:v

- ploy'ed for pioviding a :power impulse efl'fec} r .tive duiing substantially QQQdGgIQSESQf rota tiQIi of the rotor. This is a highly lmportairit advantage, and provides jfoil the smooth, uniform, flotation of;t1 1e'jrotor shift, highly de sirable in engines of a'lljchai acters, This 1s i I v vlac'c-om pli s hed by the use o f'z'm" abutment valve,

the movement of 'whiehjis practically install 7 ems-misspell the Lpproaohjofthe fotor piston thereto, sofis'to permit the'piston tolpz ss over I i r t p rt n" f 1 he i'sb i z u d b the" valve. The 'returnfofthe'valveto itsloperjative with the inclined "silyfa ce of the rotor; 'pistop} vicle a device of thety'pfe 'described in 'Which inechan'ism is eniployed for bringing about positive operation of the abiitme-ntvalve! I have found it necessarythat'the valve open 3 "and close at exaotfp'eriodsfin the rotation of tlirotoryzind thatthe foroesjoper ating the Jgiumv v valvebe positiveforees3f not thosesuchfas,

4 exerted by aispring orithe like," which might easily. become inefii'cientfthrodgh 'vve arysiibf" further purpose] positive valve is that the valve may ofthe position'ofthe eiig "the engine Williope fitelj st'tis eifioiently in an in'vefted'position asin an upi ightposi v i' 1: -tion "For this reason, myfimpl ovediroti ry englne may beadap'ted' for use wheIi'bolted 1926. ett; ivofnmss, =1

-' plic atiog; iii which t l ofthe valve 59gl'atei" described:

vide' wrotary engine vof ,theityp described in which the; pabkingibetvveen the li o'to'raiid.- statorfis arranged inl a,'partioulai lyjeifioient manne s -w p eth de h ij mm ng of t 1 1 packing strip with the statori pa'oki ng I feature of "my inve'ntionfIfdeem I i I 1 3 mp' ita t one, a d I a "Over ome? t disadvantage possessed by 'practicallyfie'very foo w packing elementson the rotor -statoi" iiieir g ty f engine employing radiany i p f ed bers.

A' ftgrthierl iIiv eiition is'tb pfo; vide ztrotaify engine ofthe type described t vvh'iehniay be co pled with other likejeligi es on asin'gle shaft'toprovidett coinpletepovver uhitfin Whichthefe is ilo dead center;

' "Oth ei" objects-and advantages williappear r in the .follovving specification; mi thefnovel j.

fe'eiture'softhe invention winbe par icula y ,m

pointed out in; the appended claims; i

P yi g dr w gsfiwinin parfij i t hi txFigu isti-i n viw ioffje et c;

Figure'tis a s ec tionsiibstaritielly ttlong the 1 in o F g re 3, s

choline 5+5 fFi-gure 4, w

Figure/,8 is

rotaqry m111tip1e portya1ve', illusti ating posi F 1*gu e;9 1 s 2t section'along tl e 1 g 9 9 x 7 p ing meansior a-ctl tttihglthg abut ent Figure fl w t 6mm dless v ,7 fi-ylt'tvvill fb e'ap v pareiitf from the v foregoirig "des'c iption th t;

:Mvi iv n ibn-j fi i a i he m m? .F'guyefg isa side elevtitioi ofltlie'ilevie l f showing theabiitment valve opemng cam;

, Figure '3 is a sideteievation of the olevioe .showlng the, closing camn dgmmlng gears; q

1 Figure-7 is a fi n' 'theiine 7+7, is *FigmieG, v

LFF

zontal axis of the stator. V tatably mounted within the chamber 13. The

tions corresponding with the respective foregoing diagrams,

Figure 19 is a detail perspective view of the cam shaft and its cams, and

Figure is a perspective view of the L- shaped packing strips.

In carrying out my invention, 1 make use of a stator 1 having removable end plates 2 and 3 at the opposite ends thereof and secured thereto by means of bolts 4. The stator 1 is supported upon a suitable base 5.

A rotor 6 consisting ofa hollow drum is keyed to a shaft 7. The shaft 7', see Figure 41, is rotatably mounted in bearing portions 8 formed in the end plates 2 and 3, respec tively. Suitable packing 9 and adjustable glands 10 are provided in the bearing members 8 for preventing the escape of steam through the bearings. The rotor 6, see Figure 5, is provided with a piston 11 extending radially from the peripheral wall of the rotor to a point closely adjacent to the inner wall 12 of the stator. F or the present, I will not describe the packingl employ between the stator and the rotor. The shaft 7 is free to rotate so that the rotor 6 may continuously rotate within the stator.

A throttle valve chamber 13 is formed integral with the stator 1 and is provided with a steam port 14. An inlet port 15 is provided and communicates with the interior of the stator 1 at a point adjacent-to the hori- A valve 16 is reconstruction of this valve is clearly shown in Figure 5, and is such as to permit the steam to pass from the steam port 14 through the chamber 13, and through the inlet port 15' into the stator when turned to the position shown in full lines in Figure 5, but. to stop the flow of steam through the inlet port when turned to the position shown in dotted lines in Figure 5. A valve stem '17 provided for the valve 16 and extends through an elongated end plate 18 employed for closing one end of the chamber 13, and serving as a hearing for the valve stem 17. The opposite'end of the chamber 13 isclosed by an end plate 19. Means for operating the valve 16 is pro vided by the use of an eccentricQO mounted upon the shaft 7 and operatively secured to the valve stem 17 by crank 21 and an adjustable rod 22. A rotation of the shaft 7 will cause an opening and closing of the valve 16 by oscillatory'move'ment of the valve stem. An exhaust port 23 is provided in the stator 1, as clearly shown in Figures' l and A. horizontal abutment valve chamber 21 is disposed upon oneside of the stator at a point directly beneath the valve chamber 13. The ends ofthe chamber 24 are closed by integral extensions of the end plates 2 and 3. A cover plate 25is disposed over the chamber 2 1, and extends from the extension of the end plate 2 to the extension of tl end plate 3, and is rigidly secured thereto. An abutment valve 26 is provided with integral runners 27 on each side thereof which are slidably disposed within horizontal slots 28 in the end plates 2 and 3. The slots 28, which extend tangentially from the shaft 7 to the cover plate 25, divide the space between the rotor 6 and the stator 1 into two parts, whereby an expansion chamber is formed. The abutment valve '26 hasan inclined surface 29 which is substantially in alignment with the inlet port 15. surface 30 which corresponds with the inclined surface of the abutment Valve 26. The abutment valve 26 is provided with tweadjustable rods 31 which extend through the cover plate 25 andare'securfed to a crosshead 32, see Figure 1.

A rocker'shaft 33 is disposed beneath the 1 36. An adjustable rod 37 is pivotally mounted upon each end of the crosshead 32, the free end of each rod being secured to its respective The piston 11 has an inclined crank 34: by means of the stud 35.. These rods also serve to limit the inward movement of the abutment (Fig. 2) when extended as far as possible along their paths of arcuate movements by the cranks 34.

In order that I may use the power i1n pulse effectively up to the very moment that the piston'll closely approaches the abutment valve 26, it is necessary that some means he provided for moving the-abutment valve I substantially instantaneously to the outermost position in the valve chamber 24. Ol)

viously therotation of the shaft 7 is too slow for the actuation of cams associated therewith and employed for this purpose. I I have therefnre provided a camshaft 38 (Figsf l. and 3) which is slidablyand rotatablymolmt ed in an elongated'bearing 39. f

A drive gear 40, secured .tothe main shaft 7, drives a pinion 11 fixed upon the cam shaft 38. The pinion is one-half the diameter of the gear 40 with theeffect that the cam shaft will make-two revolutions for every one revolution of themain shaft. The nentity for gearing the cam shaft 33 to a higher speed than themain shaft 7 is to obtain a quick movement of the abutment 26. The pinion il is substantially twice the width of the gear 4-0, so that the cam shaft .38 may be slid longitudinally without losing its en gagement with thedrive gear.

The shaft 38 carries apair of camsindividthe; abutment valve 26 3 (Fig. l 5)? in respect *Qto theworkingchambergof the stator. The

closing cam will assistandpermit a movement of the abutment valve into the working chamber, hilethe opening cam will similarly assistand permit a movement of the abutment valve "outwardly of the working .ohamber. :Power for these rnovements of the abutinent valve .is primarily derived 'from .a steam-operated actuating device presently desciibedJ; l

Thesejca-nis idlerrims92' and 93 1" Therim 92' appears asfa'qdisc when viewed fromione endof the engine (Fig. 3).j The jrim 93faPP arsasaI hub (Fig; 2-) and the' same in diameter as the valley 94 of the closing earn 901 In effectthe ca'm 90 is formed'on back ota sufhave jwh atf nay the as ficiently thick disc while the cam-91 is formed on onesideota circular hub Thus thel socalled disoiand hub presentbodiesthatlare thicker than the, cams themselves, tl1e;-.'puritsappurtenanoes, ,Will slide the-cant shaft first forwardly to bring-therollers 44 and l l/ within range of the cams 90- and ,91 as pose presently. becomingievident.'

Rollers 44and44 ride up {90 and 9laorupon the idler rims 92 "and 98 depending on whether the cam shaft" .38- has been slid forwardly in, the direction of the observer (Fig. 3), orrearwardly. Figurel shows the camshaft slid tothe limit its forward movement, but it "will presently he slid. reariwardlyin order to b'ring the rollers .44 and-44 within range of the idler rims 92 and93, because theabutnientvalve 26 isQsupposed to have 3' ust been elosed l Fig, I 5) and lit- 1' isthe function of theengagement ofthe' idlers v withfthe continuous idlerjrims to firmly hold the abutment valve in;engagementiwith the The utility otthe rims 93 and the necessityof the shaft38 b ei ng made slidi able ,longitudinjally by ieccentric 'l' and associated parts jvillrbecpnsidered together;

Gear wheel 401onmainj shaft being twice the diameterot pinion A l on cam shaft, 385' it is evident that shaft 38 twill 'ma'ke twofrevolin tions to eachrevolution of main shaft? .Itis

further evident that asthere is but one piston 'yonzrotor 6, abutmentrQT should be operated but once to each revolution of-shaft 7 ,oronce to two; revolutionsxof shalt38. l; 1

gpIt-zis furtherevidentthat as'abutment isto g be operated but once to atWo revolutions :,of-' shaft 38, ca1ns 9Q and- 9linust bein 'some'way moved out 50f Contact with rollers 414w and 44 during each alternateirevolutionj jof Icam j shaft 38,- hence, the IldfQf eccentric A7 and associated ipartfsn Roller 44 "While-riding on idler'rim 92, holds iahutinent27 1 in "contact with rotor 6', idler rim 93 vptovides; -plate forroller 4c4f 'to ride on, while roller 44 rides j on rim; 92, thus both rollers are atfalltime's in contact with either their xcamsjor -idlers;

and are at no timeheld-suspended"as would be the case' it idlers "werenot provided.

on either thecanis The i'ol'lfersw-idlrand: ,44" areiipivotallv mounted upon belloranklevers45a and 45 (Figs 1,-2 and These hell crank levers therewith, tlieifree ends of these rods being 'p-ivotally attached 1 to the 1 studs 36 5' cranks 3%;mention'ed beforeQ i An eccentric lt'rfi ledon'the,main,shaftfi, has afstrap wlt-h in'eans'for slidlngthecam shaft. 38'. The:slidingvoccurs first in one 7 direotio nrthen inthe other, during approxim'ate1y ;70 degrees of rotation- 0f the main shaft 7 ,this;operationbeing repeated during i g "each revolution- 0fthe shaft; That means comprises a. socket 48. A belltgr ank 49,

"the I Periodic'operation of theyeceentric t't'; and 'v 7' valve has again closed. The Jclosing" and a.

opening; cams? are in IsuChangular relation? especially the rearward sliding; motion, wlllnot cause 7 a. jamming against the rollers and'fi "shipgto thecain shaft38 (Figs; 13, 1 4,and 15); I that the sliding vmovements. of thecam-sha'ft l on 5 l\ lentionfl iasib een made of a steannoperated actuating device for moving the abu-tg nient Valveg26; mechanism workltogether inopening and in Contact "with; the rotor. The. actuating deyicecomprises cylinder 561(Figs; 1,.61and r 7 a.whieh is fixed. uponlthe.icover plate.25 j mi'd-way between; theadjustable'rods 31 i. i

piston l57-j reciprqcablei;inlthecylinder This deviceigand the ra "m5 closing t thedahutment valve, but said device f oes tlie actual work' of,shifting-th abmg we s re v ng he cams,90, ,9l and.the i accompanying parts of the strain. LThe i 7, n t n of t e ms. his to hold the alone 16 ies: i'Od c nne t /Wi h" cro i l heg admission; of: steam to oppo v to the Malt-hen? the; right, to withdraw T'andf return for,-

in" I other words; ;to open and closethe abutment-1.

c'valve 26; stea'm' chest 58;. disposedj be-n heath: the 'tcylinder -56," hajs' arotary multiplefjif port: valve '59 whichrturns against an insertedvalveseat 60; Steam'passages 61 and 1 pivotally.mounted'upona bracket-51 onthe. end plate S -has a b'al-l-shapedvend50 fitting I in the socket, and a forked end 52Wlth confronting ;pins:'53 engaging a, sleeve 54-,bevtweeniadjustable rings-5501i the cam shaft.

hilt

men't' valve in perfectcontrol at all times,

and to positively hold.saidabutmentvalve i *62;(:Fig.[6) aallternately conductlive steam; i i I tothe"-opposite'endsiofgthejcylinder'"56,and, also; conduct {exhaust steam it'rornigfsuch; end s so that the movements of j the piston 57 will be permitted. l j

The rotary valve 59 has six sets of live steam ports (Figs. 8, 16, 17 and 18). It also has six sets of exhaust ports. The various ports are arranged upon two circles which-are of sufficiently different diameters to bring the ports within range of the steam passages 61 and 62. Those of the live steam ports in the inner circle within'range of the passage 61 are designated 63. Corresponding exhaust ports are designated 64. Those of the live steam ports Within range of the steam passage 62 are designated 96, corresponding exhaust ports being designated 97. The :exhaustports communicate with a passageway 98 within thecvalve 59, the valve, in otherivordgbeing hollow. The exhaust ports occur only in the inner concealed wall of the valve, but the live steam ports 63 and 96 extend all the way through, to which end these ports occur in solid portions of the valve disc.

A relatively large opening 65 in an exten-' sion 99 of the valve 59 communicates with the passageway'98 and conducts exhaust steam to an appropriate outlet 100. The extension 99 serves as a hearing. The perimeter of the valve may be kept free of the cylindrical wall of the steam chest, but the inner concealed'side of the valve must bear closely against the seat 60 so that there may be noundue escape of steam.

The valve 59 is provided with a shaft 66 which extends through the steam chest 58, see Figure 7. Suitable packing 67 and an adj u'st: ble gland 68 are providedin the steam chest 58 for preventing escape of the steam free end of the bar 72 is secured to an eccened directly into the opening of the end plates 2 and 3, respectively, through which the shaft 7 is projected. It will be noted from an inspection of Fig. 10 that the outermost wall 7 of the slot 28 is nearlytangent to the peripheral wall of the opening 76 in the plates 2 and 3, respectively, through which the shaft 7 is projected. The slot 28 is not disposed radially from the center of-the opening 76. Spring-pressed packing strips 77, each held in position by a dowel 77 a (Fig. are disposed in the lowermost ends of the slots-28 Lea-7,408

and" extend from the shaft 7 outwardly as faras the peripheral edge 78 of the rotor, see FigurelO.

In order to prevent the loss of power by steam escaping from the expansion chamber to the'exhaust'port 23, I employ in the rotor 6 and the piston 11, two L-shaped springpre'ssed packing sni ers, see Figure 10, disposed in slots in theends of the rotor and the piston, and. extending radially from the shaft to and ac'ross'the peripheral wall of the piston. The two packing strips are joinedto each other by a spliced joint, as shown at 86 (Fig. 12). The portions A (Fig. 11) of these packing strips which extend radially from the t 7 are made rectangular. The portions which extend across the peripheral wall of the piston are dovetailed in cross section, and are disposed in slots 83 loose enough to be forced into contact with the interior surface'of theperipheral wall of the stator.

The innermost end of the abutment 26 is provided with a spring-pressed packing strip 87 similar in cross-sectional contour to tha portion of the L-shaped strips 81 disposed upon the outermost wall of the piston 11, and is fitted in a groove having the shape of the cross-sectional contour of the packing strip. A second spring-pressed packing strip 88 is disposed across the uppermost wall across each end of theabutment 26 and is arranged to engage with the adjacent wall of the opening 24:-

The operation is readily understood. It is assumed that th'eengineis properly connectedat 14 to a suitable source of steam, and that the piston 11 'of the rotor 6 is in the position shownin Figure 5. The position of the partsshown here indicate that the abutment valve '26has just been projected into the working chamber to the closed position. In Figure 1 the cam shaft 38 is about to be moved upwardly, or rearwardly when the observer assumes'the position in Figure 3,

and when the cam shaft is so moved the roll- 61-344 and 44' will ride upon the continuous idler rims92 and 93 (Fig. 19), firmly holding the abutment valve against the rotor.

Steam will be admitted to the working chamber byway of the inlet port (Fig.

5). The rotor 6 will be driven in the clockwise direction. 'The cam shaft 38 will be drivenin the counter clockwise direction by virtue of the interposed gearing (Figs. 1 and 3). the workingphamber to a point adjacent to the exhaust ports 23. The abutment valve 26 must be'withdrawn or opened to permit pas Assume that the piston 11 has traversed sage of the piston. The closing cam. 90 and I cylinder 56 up to t'hejpresent time, insuringnow OCQIlIS, bringing the 'parts fto the-relationship shown "in Figure l. Continued turning of the camshaft illperniitthe roll-1 er 44 to ride down the cam 90iintothe valley I ly'far to raise the roller 44 from the valley 94, (Fig. 14), While the cain-91 will elevate the roller 44? to'th'e highestpoint There has been an exchange in thelpositions of the.

rollers 44'. and 44, but by tracing the articulated connections between thebell cranks 45 and'45f and thefcross head 32 (Figs.- 1,- 2 and 3) it will be i found that the movements are so co-ordina'tdthat' an outwardmovement of the cross 'head i's permitted.

Bu'tthe actual work of'moving the cross head and of the abutment-valve 26'isYperformed by th iactuating device 57 The ro-' tary valve 59 of this devicei as'sumes thejposition' in Figure 16 during-the moment now under consideration,'na1nely,while the abut ment'rvalve EZG'isstill closed but is about to be openedf Certainones of the POItSQQTQJHd 96 are designated' A, .B "and C, while certain ones of the ports63 are designated'D,

' Exhaust port A- registers with the steam ports E and F are idle The registration of the port ,D and passage 61 provide for the presence oflive'steam in f-t-ll left end of the the holding of the piston 57 as janauxiliary of thefnn'ctioir of the Y cams already, mentioned. I 1 1 me'ntvalve 26,'the eccentric 7 3 (Fig-.i1)1 will begin impartinga turn to the valve shaft66.

I The stroke of-jtheeccentric is such thatfthe turnwilladvancejthe'ports 'A to F to the pawl 7 (Figf'9) will turn the shaft 66 onesixth of a revolution. The'first. half of this positions Figure17'. The formerly 'idle live steam p'ort B' will register'with the'pas- Q sage 62 and steam to the 'right'end 'of' the cylinder 56 driving thepiston 57 over" and retracting the".abutnnentv l". from v the working chamber. Exhaust steam from the left end of the cylinder 56 escapes through theexhaust port E whichnow registers with .7 the passage 61., T he piston 11, will pass, and;

the rollers Y44. and 44. appr Jximately still assume' the position infFigure l4. v

-:The second half or; he foregoing turnof; the valve shaft 66 will complete the advancement of the portsAfl'toF to the position in ,The formerly idle steam port F Figure 18.

now-reg1stersw1th the passage 61 to admit steam to the'left end of the cylinder 56. This f drives the piston 57 to the right and closes theabutrnent' v'alvey26 behind the pistonv 11 which hasrmade its transition at the same time the eXhaustportO registerswith the passage 62 so that residual ste amin the right end of the cylinder 56 is-permitted to pass out ahead of the piston. J

Simultaneously-With these operations the I c'amsQO and 91 will have advanced sufficient- 94, andtopermit the lowering :of theroller 4 to the level of the rim 93. Thisisthe position shown in Figure 1, and it'will be butan instant Whenthe eccentric 47 will shift the cam shaft 38 upwardly orrearwardly so that the l 'ollers'can'riide upon the continuousfl idler rims'92 and 93. It is important toKob-h serve that the rearward shift of the cam shaft 38'Will not occur until'the'rollers44and=44;j i I have been' restored'to their respective high and lovv levels 15') at Whichftime therims 92 and 93 can be shifted thereunder without danger of binding. -It-is also 'to'be' observed that the forward tunings-"m le cam shaft38 doe'sinot occuruntil thecams 90 and 91 (Fig.13) *have almost traveled around in a position to receive the rollers I i By virtue of. thearrangenient of the cams 7 ing" device 57 performs. Were the latterfide pended upon, the cutting off ofi steani aathe 'port 14-would leave such an'insufficiency of steam pressure that the abutment 'valve-26--- mio'htnot properly be Withdrawn fromfthe Working chamber by ;.the time the piston' "11f displaced for aproper perioda The movement of the abutment 26 1s practically instantaneous, due/to the fact that the cams operating the" valveare actuated by-a.

' were; about to pass over',;-At suchfa' tiinethe I opening cam v91 would not only'positively dis Still leading to the openingof the abut; place the abutment valve, but would hold v shaft'rotating at twice the speed of the en gine shaft, and that the opening andclosingi of the abutment is accomplished by positive c 1 means. 7 1

Avery important advantage provided my rotary engine is that regardless of the speed at which the rotor is'travelingpthereis nopos sibility of'the jamming betvveen the rotor and statorpacking. Y This advantage is obtained through the particularlynovel ar 1T rangement of the packingstrips'. 77 j 'and 79.f An inspection of Figure 10 will showthat the packing strip 7 9, see dotted. lines, first contaets Witlithe packing strip '77on-th'e{statorT at a single point 7 7 b adjacent'to the shaft 7 where travel is at its minimum; This'part ofthe packing strip 77 is beveled slightly at 77 0 (Figs. 5'and 10) and thereby permits'the strip 79 to ride thereupon withoutjamming: 1 The tangential and radial relationshipflof;

the'packing strips 77,79 (Fig. 10) enablesthecrossing of the strip 79 in continuouslybiased 1 positions during turning of the rotor-with no possibility of the strip 7 9 lodging in'the slot 28, which it might do if the slot28 and strip 7 9 were radial respecting the shaft. There is therefore no possibility of jamming between the packing strips, and greater force may be applied by the springs for adjusting the strips than in the ordinary type of packing strips employed with engines of this character.

I claim:

1. A rotary engine comprising a stator, a rotor rotatably mounted in said stator, a piston rigidly mounted upon said rotor extending radially therefrom and engagin with the inner walls of said stator, an abutment, steamactuated means for moving said abutment into and out of engagement with said rotor, and positive means for rigidly holding said abutment in engagement with said rotor until said rotor reaches a predetermined point in its rotative travel. v V

2. A rotary engine comprising a stator, a rotor rotatably mounted in said stator, a piston rigidly mounted upon said rotor extend ing radially therefrom and engaging with the inner walls of said stator, an abutment, means for moving said abutment into engagement with said rotor and out of engagement with said rotor and said piston, an auxiliary shaft driven by said rotor at a higher speed than said rotor, cam-actuated means actuated by said auxiliary shaft for moving said abutment int-0 and out of engagement with said rotor as said piston moves away from and approaches said abutment, respectively dui ing the rotation of said rotor, said piston having its abutment-engaging surface 111- clined with respect to the intersecting radii of said rotor, and positive means for rigidly holding said abutment in engagement with said rotor up to apredetermined point in the rotation of said rotor.

3. A rotary engine comprising a stator, a rotor rotatably mounted in said stator, a piston rigidly mounted upon said rotor extending radially therefrom and engaging with the inner Walls of said stator, an abutment carried by said stator, steam-actuating means for moving said abutment into lid outof engagement with said rotor, and cam-operated means for positively and rigidly holding said abutment in engagement with said rotor during a predetermined portion of the rotative travel of said rotor.

, 4. In a rotary engine having a circular stator with an inner wall and lateral end walls, shaft, a circular rotor carried by said shaft, and a piston having end walls and an outer wall being carried by said rotor, means for forming a tight connection between said rotor, said piston and said stator, said means comprising packing strips located in grooves in the'end walls of said stator and dispose-c tangentially of said shaft, packing strips eX- tending radially from said shaft and disposedin the end walls of said rotor and said piston, said lastnamed packing strips having portions extending inwardly at right angles and receivable in a groove in the outer wall, means carried by said portions for interlocking, and spring means for holding said packing strips outwardly. a

5. A rotary engine'comprising a stator defining a working chamber, a rotor revoluble therein and having a piston, an abutment valve movable into and out of the working chamber, fluid-operated means to actuate the abutment valve, and means working in consonance with said fluid-operated means following the movements of the abutment valve and fixedly holding it in contact with the rotor when closed. V

6. A rotary engine comprising a stator defining a working chamber, a rotor revoluble therein and having a piston, an abutment valve, fluid-operated means for moving the abutment valve into and out of the working chamber into closed and open posit-ions, a pair of cams respectively associated with the closing and opening movements of the abutment valve, and articulated connections between the cams and said fluid-operated means, working in consonance with the latter to permit the opening and closing movements but serve to positively hold the abutment valve either closed or open after the respective movements have been completed.

7. A. rotary engine comprising a stator defining a working chamber, a rotor revoluble therein having a piston, an abutment valve, fluid-operated means for moving the abutment valve into and out of the working chamber into closed and open positions, said means including a cross head carrying the abut ment valve, a pair of cams respectively associated with said closing and opening movements, and articulated connections having certain members connected with the cross head and other members co-acting with the cams, working in consonance with the cams and cross head upon closing and opening movements, but being acted upon by the cams to positively hold the abutment valve either closed or open after the movements have been accomplished. I

8. A rotary engine comprising a stator defining a working chamber, a rotor revoluble therein having a piston, an abutment valve, fiuidoperatedmeans for moving the abutment valve into and out of the working chamher into closed and open positions said means including a cross head carrying the abutment valve, a pair of cams having associated continuous idler rims, articulated connections joining the cross heads with the cams including bell cranks having rollers adapted to ride upon the cams in consonance with the closing and opening movements of the cross head, and means to shift the cams and rims causing the rollers to ride upon the rims after a closing movement of the cross head to positively hold the abutment valve against I 9., A rotary engine comprising 1;: tea-gr 1 the rotorindependently of said fluid operated means i l a c a a stator dehmng a working chamber, a mamshatthaving a rotor revoluble inthe working chamher, a piston on the rotor, an abutment valve, fiu1d-operated'means operable by fluid from the same source that supplies the working chamber to move the abutment valveinto closed and open positions, closingandbpenmg'cams havmg means associated therewith and withfthe fluid-operated means, permlte ting said closingandopening movements but positively holding the abutment; valve with drawn from the stator duringa comparative ly short openinterval, and means for positively operatingthe cams from the main shaft,

1 insuring oo-ordinated"operation between the piston and abutment valve;

; A rotar en ine com risi n a stator a main shaft/havinga 'rotor revoluble in the stator, therot'or carrying a piston, a cam .shaft, means operated :by the cam shaft to periodically slide. the cam shaft back and after movement has ceased.

11.111 a-rotary engine, a stator having a working fchamber', an iabutm'ent' valve mov able into closedand openpositionsfin respect during an opening andolosing movement of the abutment vane, andanid'ler rim with which the roller is brought into engagement.

iv-after the closing movement of the abutment valve'to'hold the latter in-said position for,

a predetermined period 12. In a rotary eng1ne,- a

able into closed and open positions in respect to the working chamber, a roller havinganv ticulated i connections [with thetab utment l valve, a'i-cam uponwhich the roller rides during an opening and closing movement "of the closing'movementof the abutment valve to holdthelatter in saidposition for a predeter hainedperibd, and means to periodically shift thecam and rim together so that the roller may alternately b within range ofthe cam and therim. s I

a 13; Ina rotary engine, a stator having a Working chambenbearing means carried by the stator, arevoluble camshaft 1,onrnaled 1nv fthe'bearing' means, aniabutmentvalvemo able "to closedandjopenpositions'in' respect a movable abutment, fluid-operated mpving c means for moving the abutment into anduout means. V. l l a. i

15 In a rotary engine, aworking chami f her, a movable abutment,'fluid operate d ov-j it ing means for moving theabutment intoand V 1 out oft-hew orkingchamber, a pair'of linkage V systems'joinedj'at one end to theimoving,

V stator having a; working chamber, an abutment valve mov- Y to; the' working i'chamber, means connected j.

"the abutment 'valve'terminating l e 1a Ca on e t m-Shaft were a isociatedfclroularidler rim, and means f r:-

periodicallysliding thefoam shaftfinits'beap' ing means to bring the cam within rangeLofI the roller during:opening'andclosing move: ments of the abutmentvalve, an'dthe rim within range oftho'rollerafter the valve" has closed to hold 'it in'said position the working chamber. I j 14. In a rotary .englne, a Working chamber, j

of the working chamber, a pair" of linkage systems joined at one end .to the moving means, and double-acting revoluble cams conf trolling the other ends 'of the linkage; systems, said cams acting through, said linkage sys} tems to limit theinward and outward nj1ove-Iw ments of said abutment an d'having contours 1 producing motions' 'in'the linkagelsystems in? with themotions iof thelmoving consonance means and-terminating in rollers at the other end, and pair' of revoluble openingmnd I closing cams, upon' which the rollers bear, one comprising a'lobe and the other'having' V a valley, respectively. causing the rollers to i ride up and down thus producing motions in motions of the moving means, and checkingthe movementjof the abutment and' limitin itspositionat the end of each stroke.

r *16. In a rotary engine, ;a Working cham- ,ber, a movable abutment, fluid-operated,"

said system, with which crank the rodfis a 'the linkage systems in consonance with the to the working chambeigaroller hav ng articulated connections with the abutment l ;v valve, a camjuponwhmh the roller ,rldes- 111g means, means actuatingthe linkage sys-w tem thereby to'check the movementsofthe abutment, and a turnable crank included in lie also joined, said rod limiting the inward" movement of the abutment when-said rod is extended" as far aspossible along its path of 'arcuate, movement with the crank.

abutment valve, an idler rimj with which the roller is brought into engagement-after the 17 In a rotary engine, a stator'having endjvvall with asha-ft opening and a slot tan- H l gentlal to the opening, a, rotor having an I end wall with .a radial slot, and packing strips occupying said slots, the tangential re llatioilship of i -nflmedslot to said shaft Penmg voiding d i' ration of the 1 slots and packing strips.

r a d i al slot situated in thc w rall adjoiningthe; stgtpr Wall and extending froin the shaft opening to the approximate end of the piston, a packing strip in the tangential slot extqhding: from the sha ip opening to the pgriphgfal line of the rotor, and'a packing stri located 3 igig strips;

in' and approximately coextensive with th? radialslot, the tangential relationship Of the first-named slot to said shaft Opening" av'oid- Eng radial iegistratioh Of the slots and pack- 351mm VIDETTO; 

